package com.sky.service.impl;

import com.github.pagehelper.util.StringUtil;
import com.sky.entity.Orders;
import com.sky.mapper.OrderDetailMapper;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 统计指定时间区间内的营业额数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
//        LocalDate currentDate = begin;
        while (!begin.equals( end)){
            //计算指定日期后一天的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天的营业额
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList){
            //根据date日期查询对应的营业额：状态为"已完成"
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null? 0.0 : turnover;
            turnoverList.add(turnover);
            //
        }
        //封装返回结果
        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        
        //总用户数量
        List<Integer> totalUserList = new ArrayList<>();
        //新增用户数量
        List<Integer> newUserList = new ArrayList<>();
        
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            
            //总用户数
            Map map = new HashMap();
            map.put("end", endTime);
            Integer totalUser = userMapper.countByMap(map);
            
            //新增用户数
            map.put("begin", beginTime);
            Integer newUser = userMapper.countByMap(map);
            
            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }
        
        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .build();
    }// ReportServiceImpl.java
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        // 存放每天的订单数
        List<Integer> orderCountList = new ArrayList<>();
        // 存放每天的有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map<String, Object> map = new HashMap<>();
            map.put("begin", beginTime);
            map.put("end", endTime);

            // 查询当天的订单总数
            Integer orderCount = orderMapper.countByMap(map);
            orderCountList.add(orderCount);

            // 查询当天的有效订单数（已完成状态）
            map.put("status", Orders.COMPLETED);
            Integer validOrderCount = orderMapper.countByMap(map);
            validOrderCountList.add(validOrderCount);
        }

        // 计算总订单数和有效订单数
        Integer totalOrderCount = orderCountList.stream().mapToInt(Integer::intValue).sum();
        Integer validOrderCount = validOrderCountList.stream().mapToInt(Integer::intValue).sum();

        // 计算订单完成率
        Double orderCompletionRate = totalOrderCount > 0 ?
                (double) validOrderCount / totalOrderCount  : 0.0;

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }
    
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        Map<String, Object> map = new HashMap<>();
        map.put("begin", LocalDateTime.of(begin, LocalTime.MIN));
        map.put("end", LocalDateTime.of(end, LocalTime.MAX));
        
        List<Map<String, Object>> salesTop10 = orderDetailMapper.getSalesTop10(map);
        
        List<String> names = new ArrayList<>();
        List<Integer> numbers = new ArrayList<>();

        for (Map<String, Object> sales : salesTop10) {
            names.add((String) sales.get("name"));
            // 修复类型转换问题
            numbers.add(((Number) sales.get("number")).intValue());
        }


        return SalesTop10ReportVO.builder()
                .nameList(StringUtils.join(names, ","))
                .numberList(StringUtils.join(numbers, ","))
                .build();
    }

    @Override
    public void exportBusinessData(HttpServletResponse response) throws IOException {
        //查询数据库，获取数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);
        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));
        /**
         * 通过POI将数据写入Excel文件中
         */
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        //基于模板文件创建一个新的Excel文件
        XSSFWorkbook excel = new XSSFWorkbook(in);
        //填充数据
        XSSFSheet sheet = excel.getSheet("Sheet1");
        sheet.getRow(1).getCell(1).setCellValue("时间："+dateBegin+"至" + dateEnd);//获得第二行
        //获得第四行
        XSSFRow row = sheet.getRow(3);
        row.getCell(2).setCellValue(businessDataVO.getTurnover());
        row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
        row.getCell(6).setCellValue(businessDataVO.getNewUsers());
        //获得第五行
        row = sheet.getRow(4);
        row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
        row.getCell(4).setCellValue(businessDataVO.getUnitPrice());
        //填充明细数据
        for (int i = 0; i <30; i++){
            LocalDate date = dateBegin.plusDays(i);
            //查询日期对应的数据
            BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
            row = sheet.getRow(7 + i);
            row.getCell(1).setCellValue(date.toString());
            row.getCell(2).setCellValue(businessData.getTurnover());
            row.getCell(3).setCellValue(businessData.getValidOrderCount());
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row.getCell(5).setCellValue(businessData.getUnitPrice());
            row.getCell(6).setCellValue(businessData.getNewUsers());
        }

        //通过输出流将数据输出到浏览器，进行下载
        ServletOutputStream out = response.getOutputStream();
        excel.write( out);
        out.close();
        excel.close();
    }

}